LLVM 22.0.0git
Public Member Functions | List of all members
llvm::ARMAsmBackend Class Reference

#include "Target/ARM/MCTargetDesc/ARMAsmBackend.h"

Inheritance diagram for llvm::ARMAsmBackend:
[legend]

Public Member Functions

 ARMAsmBackend (const Target &T, llvm::endianness Endian)
bool hasNOP (const MCSubtargetInfo *STI) const
std::optional< MCFixupKind > getFixupKind (StringRef Name) const override
 Map a relocation name used in .reloc to a fixup kind.
MCFixupKindInfo getFixupKindInfo (MCFixupKind Kind) const override
 Get information on a fixup kind.
bool shouldForceRelocation (const MCFixup &Fixup, const MCValue &Target)
unsigned adjustFixupValue (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, uint64_t Value, bool IsResolved, MCContext &Ctx, const MCSubtargetInfo *STI) const
std::optional< bool > evaluateFixup (const MCFragment &, MCFixup &, MCValue &, uint64_t &) override
void applyFixup (const MCFragment &, const MCFixup &, const MCValue &Target, uint8_t *Data, uint64_t Value, bool IsResolved) override
unsigned getRelaxedOpcode (unsigned Op, const MCSubtargetInfo &STI) const
bool mayNeedRelaxation (unsigned Opcode, ArrayRef< MCOperand > Operands, const MCSubtargetInfo &STI) const override
 Check whether the given instruction (encoded as Opcode+Operands) may need relaxation.
const char * reasonForFixupRelaxation (const MCFixup &Fixup, uint64_t Value) const
bool fixupNeedsRelaxationAdvanced (const MCFragment &, const MCFixup &, const MCValue &, uint64_t, bool) const override
 Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.
void relaxInstruction (MCInst &Inst, const MCSubtargetInfo &STI) const override
 Relax the instruction in the given fragment to the next wider instruction.
bool writeNopData (raw_ostream &OS, uint64_t Count, const MCSubtargetInfo *STI) const override
 Write an (optimal) nop sequence of Count bytes to the given output.
unsigned getPointerSize () const
Public Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend (const MCAsmBackend &)=delete
MCAsmBackend & operator= (const MCAsmBackend &)=delete
virtual ~MCAsmBackend ()
void setAssembler (MCAssembler *A)
MCContext & getContext () const
bool allowAutoPadding () const
 Return true if this target might automatically pad instructions and thus need to emit padding enable/disable directives around sensative code.
bool allowEnhancedRelaxation () const
 Return true if this target allows an unrelaxable instruction to be emitted into RelaxableFragment and then we can increase its size in a tricky way for optimization.
virtual void reset ()
 lifetime management
std::unique_ptr< MCObjectWriter > createObjectWriter (raw_pwrite_stream &OS) const
 Create a new MCObjectWriter instance for use by the assembler backend to emit the final object file.
std::unique_ptr< MCObjectWriter > createDwoObjectWriter (raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS) const
 Create an MCObjectWriter that writes two object files: a .o file which is linked into the final program and a .dwo file which is used by debuggers.
virtual std::unique_ptr< MCObjectTargetWriter > createObjectTargetWriter () const =0
virtual unsigned getMinimumNopSize () const
 Returns the minimum size of a nop in bytes on this target.
virtual unsigned getMaximumNopSize (const MCSubtargetInfo &STI) const
 Returns the maximum size of a nop in bytes on this target.
virtual bool finishLayout (const MCAssembler &Asm) const
virtual uint64_t generateCompactUnwindEncoding (const MCDwarfFrameInfo *FI, const MCContext *Ctxt) const
 Generate the compact unwind encoding for the CFI instructions.
bool isDarwinCanonicalPersonality (const MCSymbol *Sym) const
void maybeAddReloc (const MCFragment &, const MCFixup &, const MCValue &, uint64_t &Value, bool IsResolved)
virtual bool fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value) const
 Simple predicate for targets where !Resolved implies requiring relaxation.
virtual bool relaxAlign (MCFragment &F, unsigned &Size)
virtual bool relaxDwarfLineAddr (MCFragment &) const
virtual bool relaxDwarfCFA (MCFragment &) const
virtual std::pair< bool, bool > relaxLEB128 (MCFragment &, int64_t &Value) const

Additional Inherited Members

Static Public Member Functions inherited from llvm::MCAsmBackend
static const MCSubtargetInfo * getSubtargetInfo (const MCFragment &F)
Public Attributes inherited from llvm::MCAsmBackend
const llvm::endianness Endian
Protected Member Functions inherited from llvm::MCAsmBackend
 MCAsmBackend (llvm::endianness Endian)
Protected Attributes inherited from llvm::MCAsmBackend
MCAssembler * Asm = nullptr
bool AllowAutoPadding = false
bool AllowEnhancedRelaxation = false

Detailed Description

Definition at line 20 of file ARMAsmBackend.h.

Constructor & Destructor Documentation

◆ ARMAsmBackend()

llvm::ARMAsmBackend::ARMAsmBackend ( const Target & T,
llvm::endianness Endian )
inline

Definition at line 22 of file ARMAsmBackend.h.

References llvm::MCAsmBackend::Endian, llvm::MCAsmBackend::MCAsmBackend(), and T.

Referenced by llvm::ARMAsmBackendDarwin::ARMAsmBackendDarwin(), llvm::ARMAsmBackendELF::ARMAsmBackendELF(), and llvm::ARMAsmBackendWinCOFF::ARMAsmBackendWinCOFF().

Member Function Documentation

◆ adjustFixupValue()

unsigned ARMAsmBackend::adjustFixupValue ( const MCAssembler & Asm,
const MCFixup & Fixup,
const MCValue & Target,
uint64_t Value,
bool IsResolved,
MCContext & Ctx,
const MCSubtargetInfo * STI ) const

Definition at line 419 of file ARMAsmBackend.cpp.

References llvm::MCAsmBackend::Asm, assert(), llvm::dyn_cast(), llvm::MCAsmBackend::Endian, Fixup, llvm::ARM::fixup_arm_adr_pcrel_12, llvm::ARM::fixup_arm_blx, llvm::ARM::fixup_arm_condbl, llvm::ARM::fixup_arm_condbranch, llvm::ARM::fixup_arm_ldst_abs_12, llvm::ARM::fixup_arm_ldst_pcrel_12, llvm::ARM::fixup_arm_mod_imm, llvm::ARM::fixup_arm_movt_hi16, llvm::ARM::fixup_arm_movw_lo16, llvm::ARM::fixup_arm_pcrel_10, llvm::ARM::fixup_arm_pcrel_10_unscaled, llvm::ARM::fixup_arm_pcrel_9, llvm::ARM::fixup_arm_thumb_bcc, llvm::ARM::fixup_arm_thumb_bl, llvm::ARM::fixup_arm_thumb_blx, llvm::ARM::fixup_arm_thumb_br, llvm::ARM::fixup_arm_thumb_cb, llvm::ARM::fixup_arm_thumb_cp, llvm::ARM::fixup_arm_thumb_lower_0_7, llvm::ARM::fixup_arm_thumb_lower_8_15, llvm::ARM::fixup_arm_thumb_upper_0_7, llvm::ARM::fixup_arm_thumb_upper_8_15, llvm::ARM::fixup_arm_uncondbl, llvm::ARM::fixup_arm_uncondbranch, llvm::ARM::fixup_bf_branch, llvm::ARM::fixup_bf_target, llvm::ARM::fixup_bfc_target, llvm::ARM::fixup_bfcsel_else_target, llvm::ARM::fixup_bfl_target, llvm::ARM::fixup_le, llvm::ARM::fixup_t2_adr_pcrel_12, llvm::ARM::fixup_t2_condbranch, llvm::ARM::fixup_t2_ldst_pcrel_12, llvm::ARM::fixup_t2_movt_hi16, llvm::ARM::fixup_t2_movw_lo16, llvm::ARM::fixup_t2_pcrel_10, llvm::ARM::fixup_t2_pcrel_9, llvm::ARM::fixup_t2_so_imm, llvm::ARM::fixup_t2_uncondbranch, llvm::ARM::fixup_thumb_adr_pcrel_10, llvm::ARM::fixup_wls, llvm::FK_Data_1, llvm::FK_Data_2, llvm::FK_Data_4, llvm::FK_SecRel_2, llvm::FK_SecRel_4, llvm::MCAsmBackend::getContext(), llvm::ARM_AM::getSOImmVal(), llvm::ARM_AM::getT2SOImmVal(), llvm::MCSubtargetInfo::getTargetTriple(), llvm::MCSubtargetInfo::hasFeature(), I, llvm::isInt(), llvm::MCContext::IsMachO, llvm::Triple::isOSBinFormatCOFF(), llvm::Triple::isOSBinFormatELF(), joinHalfWords(), llvm::little, llvm::maxIntN(), llvm::minIntN(), reasonForFixupRelaxation(), llvm::ARM::S_TLSCALL, swapHalfWords(), and llvm::Value.

Referenced by applyFixup().

◆ applyFixup()

void ARMAsmBackend::applyFixup ( const MCFragment & F,
const MCFixup & Fixup,
const MCValue & Target,
uint8_t * Data,
uint64_t Value,
bool IsResolved )
overridevirtual

Implements llvm::MCAsmBackend.

Definition at line 1101 of file ARMAsmBackend.cpp.

References adjustFixupValue(), llvm::MCAsmBackend::Asm, assert(), llvm::big, llvm::Data, llvm::MCAsmBackend::Endian, F, Fixup, llvm::MCAsmBackend::getContext(), getFixupKindContainerSizeBytes(), getFixupKindNumBytes(), llvm::MCAsmBackend::getSubtargetInfo(), llvm::mc::isRelocation(), llvm::little, llvm::MCAsmBackend::maybeAddReloc(), and shouldForceRelocation().

◆ evaluateFixup()

std::optional< bool > ARMAsmBackend::evaluateFixup ( const MCFragment & F,
MCFixup & Fixup,
MCValue & ,
uint64_t & Value )
overridevirtual

Reimplemented from llvm::MCAsmBackend.

Definition at line 1082 of file ARMAsmBackend.cpp.

References llvm::MCAsmBackend::Asm, F, Fixup, llvm::ARM::fixup_arm_thumb_blx, llvm::ARM::fixup_arm_thumb_cp, llvm::ARM::fixup_t2_adr_pcrel_12, llvm::ARM::fixup_t2_ldst_pcrel_12, llvm::ARM::fixup_t2_pcrel_10, llvm::ARM::fixup_t2_pcrel_9, and llvm::ARM::fixup_thumb_adr_pcrel_10.

◆ fixupNeedsRelaxationAdvanced()

bool ARMAsmBackend::fixupNeedsRelaxationAdvanced ( const MCFragment & ,
const MCFixup & Fixup,
const MCValue & ,
uint64_t Value,
bool Resolved ) const
overridevirtual

Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.

Reimplemented from llvm::MCAsmBackend.

Definition at line 315 of file ARMAsmBackend.cpp.

References llvm::MCAsmBackend::Asm, Fixup, needsInterworking(), and reasonForFixupRelaxation().

◆ getFixupKind()

std::optional< MCFixupKind > ARMAsmBackend::getFixupKind ( StringRef Name) const
overridevirtual

Map a relocation name used in .reloc to a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Reimplemented in llvm::ARMAsmBackendELF.

Definition at line 47 of file ARMAsmBackend.cpp.

◆ getFixupKindInfo()

MCFixupKindInfo ARMAsmBackend::getFixupKindInfo ( MCFixupKind Kind) const
overridevirtual

Get information on a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Definition at line 67 of file ARMAsmBackend.cpp.

References assert(), llvm::MCAsmBackend::Endian, llvm::FirstTargetFixupKind, llvm::MCAsmBackend::getFixupKindInfo(), llvm::mc::isRelocation(), llvm::little, and llvm::ARM::NumTargetFixupKinds.

◆ getPointerSize()

unsigned llvm::ARMAsmBackend::getPointerSize ( ) const
inline

Definition at line 63 of file ARMAsmBackend.h.

◆ getRelaxedOpcode()

unsigned ARMAsmBackend::getRelaxedOpcode ( unsigned Op,
const MCSubtargetInfo & STI ) const

Definition at line 182 of file ARMAsmBackend.cpp.

References llvm::MCSubtargetInfo::hasFeature().

Referenced by mayNeedRelaxation(), and relaxInstruction().

◆ hasNOP()

bool llvm::ARMAsmBackend::hasNOP ( const MCSubtargetInfo * STI) const
inline

Definition at line 25 of file ARMAsmBackend.h.

References llvm::MCSubtargetInfo::hasFeature().

Referenced by writeNopData().

◆ mayNeedRelaxation()

bool ARMAsmBackend::mayNeedRelaxation ( unsigned Opcode,
ArrayRef< MCOperand > Operands,
const MCSubtargetInfo & STI ) const
overridevirtual

Check whether the given instruction (encoded as Opcode+Operands) may need relaxation.

Reimplemented from llvm::MCAsmBackend.

Definition at line 205 of file ARMAsmBackend.cpp.

References getRelaxedOpcode().

◆ reasonForFixupRelaxation()

const char * ARMAsmBackend::reasonForFixupRelaxation ( const MCFixup & Fixup,
uint64_t Value ) const

Definition at line 217 of file ARMAsmBackend.cpp.

References checkPCRelOffset(), Fixup, llvm::ARM::fixup_arm_thumb_bcc, llvm::ARM::fixup_arm_thumb_br, llvm::ARM::fixup_arm_thumb_cb, llvm::ARM::fixup_arm_thumb_cp, llvm::ARM::fixup_bf_branch, llvm::ARM::fixup_bf_target, llvm::ARM::fixup_bfc_target, llvm::ARM::fixup_bfcsel_else_target, llvm::ARM::fixup_bfl_target, llvm::ARM::fixup_le, llvm::ARM::fixup_thumb_adr_pcrel_10, llvm::ARM::fixup_wls, llvm_unreachable, and llvm::Offset.

Referenced by adjustFixupValue(), and fixupNeedsRelaxationAdvanced().

◆ relaxInstruction()

void ARMAsmBackend::relaxInstruction ( MCInst & Inst,
const MCSubtargetInfo & STI ) const
overridevirtual

Relax the instruction in the given fragment to the next wider instruction.

Parameters
[out]InstThe instruction to relax, which is also the relaxed instruction.
STIthe subtarget information for the associated instruction.

Reimplemented from llvm::MCAsmBackend.

Definition at line 329 of file ARMAsmBackend.cpp.

References llvm::MCInst::addOperand(), assert(), llvm::MCOperand::createImm(), llvm::MCOperand::createReg(), llvm::MCInst::getOpcode(), getRelaxedOpcode(), and llvm::MCInst::setOpcode().

◆ shouldForceRelocation()

bool ARMAsmBackend::shouldForceRelocation ( const MCFixup & Fixup,
const MCValue & Target )

Definition at line 936 of file ARMAsmBackend.cpp.

References llvm::MCAsmBackend::Asm, Fixup, llvm::ARM::fixup_arm_blx, llvm::ARM::fixup_arm_condbl, llvm::ARM::fixup_arm_thumb_blx, llvm::ARM::fixup_arm_uncondbl, llvm::FixupKind(), and needsInterworking().

Referenced by applyFixup().

◆ writeNopData()

bool ARMAsmBackend::writeNopData ( raw_ostream & OS,
uint64_t Count,
const MCSubtargetInfo * STI ) const
overridevirtual

Write an (optimal) nop sequence of Count bytes to the given output.

If the target cannot generate such a sequence, it should return an error.

Returns
- True on success.

Implements llvm::MCAsmBackend.

Definition at line 352 of file ARMAsmBackend.cpp.

References llvm::Count, llvm::MCAsmBackend::Endian, llvm::MCSubtargetInfo::hasFeature(), hasNOP(), llvm::raw_ostream::write(), and llvm::support::endian::write().

The documentation for this class was generated from the following files:
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